Bursting machine



May 8, 1945. J. E. EUTH BURSTING MACHINE Filed March 16, 1944 y@ m ff Patented l May 8, 1945 "Bunsfrmo ivrAcmNE4 Jahn; E. Eumchicago, 1l1.,;assrgnortmlrhitew Kartographie RegisterA vC omgang-g. ai corporation;

` Applicants 16, 19411'senar No, 526,799

4% Claims. (Cl. 11545-8452 K Y drives tiene fees-mus. 115 througngears,6,1m

c This, invention, relates taY improvements inl a bursting machine which. automatically separates a continuous web of stationary intoseparateform length at lines: of,kv weakening providedin the web between. forms.-`

In the machines Aoffthis. type. a strip ot stationery i's-ed.- between. two pairs. of; gripping rolls wherein. thel rear set. of' rollsy is` operating. at. a higher rate of. speed. than.` the front set. of rolls, and' theficntset orollslis usually` provided with' segmental gripping'portions so that the web is f periodically,4 released and maintained under the control of a positive aligning device at the front of the machine. It will be understood that after a form length has been torn from the advancing web, the web may be under some tension in front 1 order'to tensionfthe web between said feed-rolls.

of the front feed-rolls, and when the segments-l release the web it has a tendency to move in the opposite direction to relieve this tension. One. of the objects of the present improvement is to provide a friction feed in back of vthe front feed rollers, so as to restrain reverse movement of the paper and assist in projecting the free end of the n web into the bight of the rear feed-rolls.

Another object of the invention is to providey one or more crowned rollers on one of the auxiliary feed-roll shafts, so as to initiate bursting of Vthe web along the line of weakening where it contactsv the crowned roller. e

A further object of the invention is to provide improved means for facilitating vadjustment "on the frame of the carriage'which carries the front feed-roll, and to facilitate locking the carriag in a desired adjusted position. "3 l The present invention is an improvement on a printing and bursting machineof the type shown in OConnell Patent No. 2,344,720, issued March The invention is illustrated in the preferred dicated at 25, and rests on the top'of thev rack I8.` A rock-shaft 26 is journalled in thecarriage 30 Near each -end embodiment in the accompanying vdrawing in which Figure 1 is a fragmentary elevational View of a plan View of the same. f

In the embodiment illustrated, a main frame 3 is provided at its rear end with bearings 4, for a pair of coacting feed-rolls 5, which are geared togetherv as indicated at 6, and driven positively from a gear 1, provided with a sprocket 8 and a driving chain 9. The lower feed-roll shaft is provided with a miter gear Il), which drives a a machine embodyingthe invention; and Fig. 2,

- miter gear II on a shaft I2, to which is splined a sleeve I3, provided with a miter gear I4, which vided". on.v a ,shiftable carriageY L1;

free top; @i te@ frame ispravided with a. mer` gear I,8`,.,whichris engaged by gears I9', fixed to. a shaft. which is. jpurnalledirr the carriage,` Il, andli's .prloy'L:l'3d,.2l1.oney ndlwithia hand vvl'ieelu 2J 'I'lu's it will be understood that, the. ,carriage I1 withlthe, front ieedl-rollsmay bemovedto or from the. rear feedirolls. 5j, to accommodate different frmllengthssof. stationery, by. turning the hand wheelLZJI.. l'tiwillbe understood-that the4 rear feed-rolls. 52, are driven intimedrrelationgtoand slightly faster than"the front feed-rollsv I5,.in

Preferably the upper rear 4feed-roll 4,` and the upper front feed-roll I5, are provided with gripping Asegments so that a web oi stationery ad-` vancing between the fixed guides 22, will be periodically released. As shown in the OConnell patent, the machine is provided at its front end with a positive `aligning mechanism which is driven' in timed relation to the feed-roll, and regulates the rate of advance of the web; y

As shown in Fig. 1, the carriage I1 has at each end a projection 23, which extends under the rack I8. A'n arm 24 is pivoted to the carriage as in-` and provided with a handle 28. of the rock-shaft is fixed a cam 21, so that by turning the handle 28, the arms 24 will be forced tightly into engagement with the rack I 8, and the i carriage willbe locked in the adjusted position,

` Inrthe present embodiment an auxiliaryfeeding device is provided on `the carriage between` the main feed-rolls 5 and I5. A lower cross shaft 29 isgeared to an upper cross shaft 30, and these shafts are driven from the gearing I6 by means i of a pinion 3|. The lower cross shaft is provided with a metal rol1er,`and the upper. cross shaft `is provided with a coacting rubber roller 32, which' is journalled on the 'shaft between the xed collars 33. l A compression spring 34 is provided on the shaft to press the roller against one ofthe collars 33 and form a light frictional driving clutch. The gearing onthe auxiliary feed mechanism issuch that theperipheral speed ofthe l roller 32 is slightly greater than that of the roller I5, and accordingly it lightly urges the web forwardlyat all times, and particularly when the feed segments on the roll I5 have released the web. The pressure between the auxiliary feeding rolls may be regulated by turning. screws 35.y

As .shownj in Fig. 2, the'crossshaft 3D is ,pro-v vided with apair of crowned rolls 36, which are adjustable along the shaft by means of setscrews 31. The crowned rollers project into the direct path of a web tensioned between the front and rear feed-rolls, and as this increasesthe tension of the web at those points, bursting atthe line .of weakening is initiated at those points.

The foregoing detaileddescription isfgiven'for clearness of understanding only, and no unneces-` sary limitations should be understood therefrom, for some modifications will skilled in the art.

I claim: l

l the feed-rolls on the auxiliary cross shafts slightly be obvious to those 1.-In a machine for automatically` bursting a y continuous Iweb of stationery; advancing: from front to rear, into separate forms at lines of Weakening between forms, comprising: a frame;` a.y

pair of rear coacting feed-rolls journalled in said frame; a feeding unit on said frame in' frontlo'f l f said rear feed-rolls;` a pair of front coacting segmented feed-rolls journalled in said feedingunit with their axes disposedjpa'ralleI to axes of the u vrear feed-rolls and spaced at leastgone form- `length"'therefrorm; means'for driving the rear feed-rolls in timed relaiiiofny to and slightly faster than the front feed-rolls; an upper anda lower auxiliary' cross shaftjlournalled in the feeding unitfinfrearof said vfrontA feed-rolls; a feedroll journalled on one of said auxiliary cross shafts and provided with a friction clutchfor driving said feed-roll therefrom; a feed-roll mounted on theother auxiliary cross 'shaft to croactlwith the clutch driven feed-roll; andk means forddriving faster than the front feed-rolls. A Y

' 2. In a bursting machine: a frame; a pair of rear, coacting feed-rolls journalled in said frame; n

frame; rand releasable locking means at eachA end 4,ofthe carriage forfsecuring ther carriage' in an adjuste'dposition on the frame.

A machine as specified in claim 2',`in which the releasable locking means includes a .rockshaft journalled in thev carriage and is providedr at yeach end with a cam adapted yto clamp the carriage against said frame.

4. 'A machine as specified in claim 1, including at leastone crowned-roller adjustably mounted 0n one of ther auxiliary cross shafts to project through a desiredL point intermediate of the mart gins and into the direct path of a tensionedweb I traveling from the front to the rear feedfrolls and initiate tearing of the webxat that point.

JOHN 

